Vendor lineage
USP - where a lot of this started
Brazilian public university whose computing departments seeded the industry around it.
The University of Sao Paulo appears on an industry timeline for the same reason MIT and Stanford appear on the American one: the companies in this record were founded by people who met somewhere, and for a large share of the Brazilian ones that somewhere was a public university.
The pattern is visible across this timeline without being stated anywhere on it. A national computing industry needs three things at once - engineers, a reason to employ them, and somewhere they overlap before they have jobs - and a large public university supplies the first and third at no cost to the companies that benefit.
It is also why the market-reserve argument had a technical constituency and not only a political one. The people making the case that Brazil could build its own machines were, in many cases, the people teaching the subject.